Abstract: A burgeoning number of toolkits dedicated to improving health care exist but development guidance is lacking. The authors convened a panel of health care stakeholders, including developers, purchasers, users, funders, and disseminators of toolkits. The panel was informed by a literature review that analyzed 44 publications and 27 toolkits. A modified Delphi process established recommendations and suggestions to guide toolkit development. The panel established 12 recommendations for content and 1 recommendation for toolkit development methods. The recommendations are accompanied by 11 suggestions for toolkit content, 9 suggestions for development methods, and 6 suggestions for toolkit evaluation methods. The authors established a set of key recommendations and suggestions addressing the content, development, and evaluation methods of quality improvement toolkits, together with a ready-to use checklist. The guidance aims to advance the value of toolkits as an emerging method to effectively disseminate interventions to improve the quality of care.